@article{AL_2006_45_1_a3,
     author = {Yu. L. Ershov},
     title = {Rogers {Semilattices} of {Finite} {Partially} {Ordered} {Sets}},
     journal = {Algebra i logika},
     pages = {44--84},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2006_45_1_a3/}
}